Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1982-10-06
1984-05-08
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
2643287, B29G 300
Patent
active
044473869
ABSTRACT:
A method and apparatus are described. A thermosetting molding material, suitably a synthetic resin composition such as a phenolic molding composition, is initially heated and plasticized. The plasticized mass is passed as a stream through an injection nozzle which is maintained at a temperature sufficiently high to keep the mass in a plasticized condition but sufficiently low to avoid any substantial curing or setting-up of the mass. The plasticized mass is next passed through a temperature-controlled zone maintained at a temperature sufficiently high to keep the mass in a plasticized condition but sufficiently low to avoid any substantial curing or setting-up of the mass. The plasticized stream is passed into a partially open, heated mold. The mold cavity is maintained at temperatures sufficiently high to cure the thermosetting molding material. When the partially open mold is partially full, the feed steam is interrupted, and the mold is then completely closed to press and cure the enclosed plasticized material. The cured, finished article is removed from the mold and the process repeated.
An apparatus for conducting the process of the invention includes a stationary assembly and a movable assembly. The stationary assembly is comprised of a stationary platen which has a heat plate, a temperature-controlled sprue bushing and a mold face positioned thereon. The movable assembly is comprised of a movable platen which has a heat place mounted thereon and a mold face, corresponding to, and adapted to be aligned with, the mold face on the stationary assembly to form a partially open mold cavity. Means are provided to feed a supply of thermosetting molding material through the sprue bushing into the partially open mold cavity. Means are provided to completely close the mold cavity and place the apparatus in a compression stage. Means are also provided for the subsequent retraction of the movable assembly to allow removal of a molded article and access to the mold area.
REFERENCES:
patent: 3591897 (1971-07-01), Perras
patent: 3632729 (1972-01-01), Bielfeldt
patent: 3787159 (1974-01-01), Bielfeldt
patent: 3797984 (1974-03-01), Yago
patent: 3807921 (1974-04-01), Murgatroyd
patent: 3819312 (1974-06-01), Arpajian
patent: 4017242 (1977-04-01), Mercer
Japan Plastics Age, vol. 16, No. 1/2, 1978, pp. 19-22.
S. P. E. Journal, vol. 27, No. 9, (9-1971), pp. 30-32 by George B. Rheinfrank.
European Plastics News, vol. 5, No. 2, (2-1978), pp. 24 & 27.
Colored Thermosets Get Competitive, pp. 8-9.
Japan Plastics Age, vol. 13, No. 3, 1975, pp. 13, 20-24.
Bainbridge Robert W.
Dannels W. Andrew
Mudd James F.
Occidental Chemical Corporation
Pavelko Thomas P.
Tao James F.
LandOfFree
Process for runnerless injection - compression molding of thermo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for runnerless injection - compression molding of thermo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for runnerless injection - compression molding of thermo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1601841